CN101813494B - Method for eliminating interference of sensor and outside thereof - Google Patents
Method for eliminating interference of sensor and outside thereof Download PDFInfo
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- CN101813494B CN101813494B CN2010101141333A CN201010114133A CN101813494B CN 101813494 B CN101813494 B CN 101813494B CN 2010101141333 A CN2010101141333 A CN 2010101141333A CN 201010114133 A CN201010114133 A CN 201010114133A CN 101813494 B CN101813494 B CN 101813494B
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Abstract
The invention belongs to the automatic test field, in particular to a method for eliminating of a sensor and outside thereof. The solved technical problem is to provide a method for eliminating sensor performance change and outside interference according to the current quantity and variable quantity of sensor output and through several judgment rules and special arithmetic processing. The method comprises the following steps that: 1 the base value B of the sensor output is confirmed, which reflects the output of a sensor when quantity to be measured is zero, 2 the current output value V of the sensor output is read out, and 3 the actual value R of the sensor output is calculated, if the interference, that is the sensor performance change and the outside interference, only influences the zero point of the sensor output, R=V-B is adopted to calculate and if the interference influences the sensitivity of the sensor, the R=(V-B)/B is adopted to calculate. The invention can solve the false judgment problem of the sensor well.
Description
Technical field
The invention belongs to field of automatic testing, relate to a kind of method of eliminating sensor self and external interference specifically.
Background technology
Being generally used for detecting the sensor of slow change modeling amount, generally all is according to the measured size of the direct reflection of the size of sensor output signal (voltage or electric current); But in actual use, sensor can receive the influence of extraneous various factors, and for example: pyralarm is worked year in year out, and its sensor can receive the pollution of dust in the air etc. unavoidably, handles with conventional detection to occur the embarrassment reporting by mistake or do not report unavoidably.In the middle of producing, also there is performance difference each other in a plurality of sensors, and the debugging calibration is a very artificial thing of expense respectively.Therefore same sensor is along with the continuity of time, and performance also can change, and is difficult to reflect real situation, lost sensor original have a meaning, the sensor wrong report also might take place and various inconveniences in causing producing, living.
Summary of the invention
The technical matters that the present invention will solve provides a kind of according to the current amount of sensor output and its variable quantity, through several judgment rules and special algorithm process, eliminates the method for variation of sensor self performance and external interference.
For solving the foregoing invention problem, the method for elimination sensor of the present invention self and external interference comprises following four steps, is respectively: the substrate value B of sensor output is confirmed in (1), and it has reflected in the output that is measured as zero situation lower sensor; (2) the current output valve V of pickup; (3) calculate actual measurement value R; If disturb, promptly the sensor self performance changes and external interference, when just influencing the zero point of sensor output, adopts R=V-B to calculate; If interference can cause the sensitivity of sensor to change, then use R=(V-B)/B to calculate.
As further improvement of the present invention, the method for described definite substrate value B might as well be called and stablize the hop rate threshold value for earlier an appropriate sensor output hopping rate-valve value to be set; Under usual situation, sensor rates of change is always less than this threshold value, and normal substrate value B is just thought in the sensor output of satisfying under this condition, and this value is in store always, but real-time update; If sometime, the sensor output value rate of change has surpassed this threshold value, and the output valve of this moment is not just thought substrate value B; Adopt this method when guaranteeing the original sensitivity of alarm, to reduce the probability of wrong report.
As a further improvement on the present invention; The method of described definite substrate value B is set appropriate upper limit threshold and lower threshold for also sensor being exported the hop rate threshold value; If when sensor was exported hop rate greater than upper limit threshold, the output valve of sensor was exactly substrate value B; If sensor rates of change just drops between the lower threshold and upper limit threshold of sensor hop rate; Need to investigate the subsequent scenario of sensor output; If it temporarily no longer changes; Substrate value B is deducted a fixed value at interval by a regular time at every turn, if sensor output value is constant always, substrate value B finally can reduce to and equal currency; Thereby what make the final reflection of substrate value B is the truth of sensor after contaminated, stops this each successively decreasing simultaneously.If such design is to be in the rugged environment to sensor; There are foreign material to dance in the air on every side or opaque drop splashes; Can be stained with these things suddenly unavoidably on the sensor; The probability of wrong report can increase greatly, and this kind improvement can reduce the probability reported by mistake greatly, has strengthened the reliability of working sensor.
As further improvement of the present invention, the result of calculation that draws in described the 4th step is carried out suitable smoothing processing; Adopt this kind smoothing processing, can further eliminate sensor self and extraneous interference so that the fluctuation of result of calculation is littler.
The present invention handles through several judgment rules and special method according to the total amount of sensor output and its variable quantity, eliminates performance variation of sensor own and external interference, has solved the problem of erroneous judgement well.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Embodiment
Below in conjunction with Figure of description the present invention is done further detailed introduction.
The present invention belongs to monitoring according to following several hypothesis (1) whole test process, i.e. a long-term test process that is constantly carrying out; (2) sensor at short notice self performance do not have obvious variation; (3) in test process, the real measured relatively more fixing rate of change that has; (4) real measured at ordinary times very little, can ignore.
If variable B is the substrate value of sensor output, reflected the output that is measured as zero situation lower sensor; If variable V is the current output of sensor.
Fig. 1 shows process flow diagram of the present invention; The method of elimination sensor of the present invention self and external interference mainly comprises following five steps: substrate value B is confirmed in (1); (2) the currency V of pickup; (3) calculating sensor output value R: if disturb is that the sensor self performance changes and external interference, when just influencing the zero point of sensor output, should adopt R=V-B to calculate; If interference can cause the sensitivity of sensor to change, then use R=(V-B)/B to calculate.
The sensor output value R that so obtains should be to eliminate or be the result who has weakened the influence of sensor self and external interference greatly at least.
But the accurate acquisition of substrate value B is difficult, and how it distinguishes with sensor currency V is key point of the present invention.
Take pyralarm to do example, the processing thinking that the present invention is special can be described well.
Suppose that at first this pyralarm uses common light-electric transducer, its principle is exactly to reflect smokescope in the air through the transparency that detects air, and then reaches the purpose of monitoring firework; Traditional way is exactly that sensor output threshold value is set simply, when the output of sensor during less than this threshold value, just can trigger alarm and give the alarm.
Because of pyralarm all is that fire alarm does not take place what run at ordinary times; Therefore the output of its sensor is typical substrate value B; It has comprised the difference and the performance change of sensor self, and the smog of the interference of environment such as dust, cigarette etc. cause sensor output value to descend or the like to the pollution of sensor; These factors are very slowly to the influence of sensor output; And in case fire alarm takes place; It is more violent that the smog that is produced cause the output of sensor to change to be compared; Based on these characteristics; We can be provided with an appropriate sensor output hop rate threshold value, are called and stablize the hop rate threshold value.Under usual situation, sensor output hopping speed is always less than this threshold value, and normal substrate value B is just thought in the sensor output of satisfying under this condition, and this value is in store always, but real-time update; If sometime, the sensor output value pace of change has surpassed this threshold value, and the output valve of this moment is not just thought substrate value B; Sensor output value R through just obtaining after the above-mentioned computing being caused by real fire alarm decides an alarm threshold value on this basis again, just can eliminate or reduce greatly the probability of pyralarm wrong report; Adopt this method when guaranteeing the original sensitivity of pyralarm, to reduce the probability of wrong report.
If pyralarm is placed in the rugged environment, there are foreign material to dance in the air on every side or opaque drop splashes, can be stained with these things suddenly unavoidably on the sensor; At this moment, the output meeting of sensor suddenly descends, and according to above-mentioned rule, this situation will be reported by mistake.
One object of the present invention is exactly to solve such problem; Above-mentioned sensor is stablized the hop rate threshold value be decided to be lower threshold, decide an appropriate upper limit threshold in addition again, be used for tackling the sort of emergent interference; Because with respect to real fire alarm; The bigger foreign material sensor values rate of change that on sensor, causes that drops is much bigger, increases the another one regulation in this kind situation, when that is to say the sensor values rate of change greater than upper limit threshold; The output valve V of sensor also thinks substrate value B; If the dirt on the sensor has fallen again, the current output valve V of sensor will become greater than current substrate value B quickly, so just need upgrade substrate value B at once.
The present invention also has a special measures to deal with small particle to drop on the situation on the sensor; If the appearance of small particle just drops between sensor hop rate lower threshold and the upper limit threshold sensor rates of change,, can be taken as real smog and treat by above-mentioned existing rule; What but small particle was different with real smog is; It is just motionless that in a single day it be stained with sensor; Being reflected in the output of sensor is that a saltus step is arranged earlier, just no longer includes variation then, thinks to have earlier this moment the fire alarm maybe for the time being; And investigate the subsequent scenario that sensor is exported: if the output currency V of sensor temporarily no longer changes; Then substrate value B is deducted a fixed value at interval according to a regular time at every turn, if sensor output is constant always, substrate value B finally can reduce to the currency that equals sensor.Thereby what make the final reflection of substrate value B is contaminated later truth, stops this each successively decreasing simultaneously.B moves closer to currency along with the substrate value, and the smog value that calculates by above-mentioned R=V-B or R=(V-B)/B must also diminish gradually, finally is 0.In addition, if the smoothing processing in addition suitable again to the result of calculation of R=V-B or R=(V-B)/B, the end value fluctuation that so above-mentioned this situation causes is just littler.
The sensor that method the drew output value R that uses elimination sensor of the present invention self and external interference is that elimination perhaps is to have weakened the influence of sensor itself and external interference greatly at least, therefore can solve the problem of sensor erroneous judgement well.
Claims (2)
1. method of eliminating sensor self and external interference, it is characterized in that: it comprises the steps:
(1) confirm the substrate value B that sensor is exported, it has reflected in the output that is measured as zero situation lower sensor;
(2) the current output valve V of pickup output;
(3) the actual amplitudes R of calculating sensor output: if disturb is that the sensor self performance changes when just influencing the zero point of sensor output with external interference, and employing R=V-B calculates; If interference can cause the sensitivity of sensor to change, then use R=(V-B)/B to calculate; The substrate value B of described definite sensor output that is: is called and stablizes the hop rate threshold value for an appropriate sensor output hopping rate-valve value is set earlier; Under usual situation, sensor output hopping speed satisfies the sensor output value of this condition and just thinks normal substrate value B always less than this threshold value, and B is in store always for this substrate value, but real-time update; If sometime, the sensor output value pace of change has surpassed this threshold value, and the output valve of this moment is not just thought substrate value B.
2. the method for elimination sensor as claimed in claim 1 self and external interference; It is characterized in that: the substrate value B of described definite sensor output is for setting appropriate upper limit threshold and lower threshold with sensor output hopping rate-valve value; Lower threshold is aforementioned stable hop rate threshold value; If sensor output hopping speed is during greater than upper limit threshold, the output valve of sensor is exactly substrate value B; If sensor rates of change just drops between lower threshold and the upper limit threshold; Need to investigate the subsequent scenario of sensor output; If it temporarily no longer changes, then substrate value B is deducted a fixed value at interval by a regular time at every turn, if sensor output value is constant always; Substrate value B finally can reduce to and equal currency V, and stops this each successively decreasing simultaneously.
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| KR101232432B1 (en) * | 2010-11-12 | 2013-02-12 | 현대모비스 주식회사 | Occupant classifying device for an automobile |
| DE102012210525A1 (en) * | 2012-06-21 | 2013-12-24 | Robert Bosch Gmbh | Method for functional control of a sensor for detecting particles and sensor for detecting particles |
| CN111089941A (en) * | 2019-12-05 | 2020-05-01 | 四方光电股份有限公司 | Formaldehyde detection device and detection method thereof |
| CN112487052B (en) * | 2020-11-13 | 2024-05-10 | 四川泛华航空仪表电器有限公司 | High-stability fuel density data processing method |
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| CN1451963A (en) * | 2002-04-17 | 2003-10-29 | 福州大学 | Gold-label test strip quantitative testing method and system |
| CN1479081A (en) * | 2003-07-03 | 2004-03-03 | 上海交通大学 | Registration deviation on line compensation method of multisensor grafting tracing system |
| US7096085B2 (en) * | 2004-05-28 | 2006-08-22 | Applied Materials | Process control by distinguishing a white noise component of a process variance |
| CN101435718A (en) * | 2008-12-22 | 2009-05-20 | 徐州市三原技术产业有限公司 | Multiple-sensor information fusion apperceive compensation method and system of electronic belt weigher |
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